| Modern society has stepped into a highly developed digital informational age. Computer and Network has spreaded all over the society. Information security and sciential property right have been risen to a new level. It is a focused problem that how to protect data and software sciential property right in field of informational technology.Firstly, the basic principle and method of encryption are recommended in the paper. Then the basic principle of software encryption, typical technologies and classical encrypted arithmetic are discussed. The merits and disadvantages of software encryption technology are compared. The project of software encryption based on USB is researched and proved . The method of realization which based on software encryption platform is promoted. The circuit of hardware and flow chart of software are designed in the paper. The reliability of software design in high level and low level is discussed.The concept of digital signal process and PCI bus based on main stream DSP chips, TMS320VC54X serials and PCI interface chips, AMCC S5933, are recommended. The watch and control software for general data encryption card based on PCI interface is designed and realized. The problems of the card are particularly analysed and the improving methods are promoted. |
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